Skeletant (special Antlan)
Submit the case sensitive code one of the following case-sensitive codes.
POSTYV
PSYCHIC

Shaorin (Suzurin)
Submit the case sensitive code 3cC2dD4 .

Ragnaroks (Dragon)
By combining a a Diva with a Monol you will get a Ragnaroks. Its a Special Blue Monster and is the second best dragon in the game. Submit the case sensitive code DRG_RGN at the shrine.

Phenoix
Submit the case sensitive code POLARIS at the shrine.

Pixie
Submit the case sensitive code CHIDCHID to get a special Pixie. By combining a a Pixie with Naga you will get a rare Allure Pixie. Submit the case sensitive code exodia to get a special pixie named truenos.

Prepee (Octopee)
Submit the case sensitive code OPENBOOK .

Pantheon (Garu)
Submit the case sensitive code X-Blade .

Mew
Submit the case sensitive code Numbuh4 to get a white Mew.

Ombren (Gali)
Submit the case sensitive code RACCOON at the shrine.

Kuloru (MoMo)
Submit the case sensitive code LIKETEA .

Joker
Submit the case sensitive code CALIENTE to get a Joker named Anathema.

Garu
Submit one of the case sensitive codes one of the following case-sensitive codes.

Special monsters
Submit the case sensitive codes EXODIA and YUGKPUY to get two special monsters.
Submit the case sensitive code Vintow, vintow, and He8dge to get three special monsters.

Better monster stats
Place any two letter or two numbers and put 1, 3, or 8 as the third character to get a high stats monster, with one of these three traits with it. Examples are: cd1 for a monster with hight Success.

cd2 for a monster with high Earth.
cd8 for a monster with high Expert.

Monster names
Some monster name codes may not work because you may first need to battle the monster at a random event or get permission or an invitation to be able to raise them.